Question

我尝试过使用：

$name = $_SESSION['userid'];

但它不起作用。我也尝试了其他答案，但无济于事。

编辑：是的我正在使用session_start(); S_SESSION用户名工作正常，但用户ID不返回任何内容。

这是整个代码，抱歉不包括它：

＆＃13;

<?php
session_start();
if (isset($_SESSION['username'])){
$name = $_SESSION['userid'];
}

$conn = new mysqli('localhost', 'root', '', 'phvatsim') or die ('Cannot connect to db');

if(isset($_POST['confirm']))
{
$name = $_SESSION['userid'];
$address = $_POST ['adr'];
$product = $_POST ['product'];
$contact = $_POST ['con'];
$email = $_POST ['ema'];
$prod_qty = $_POST['prod_qty'];
$cash=$_POST['cs'];
$username = $_SESSION['username'];
    
$result = mysqli_query($conn,"SELECT `stocks` FROM `products` WHERE productname = '$product'");
$message = "<script>alert('Order Placed to our Database! We will contact you on the e-mail you provided for your order sumamry, Thank You!');</script>";

while($row = mysqli_fetch_array($result))
{
$_SESSION['stocks'] = $row['stocks'];
}

$newstocks = $_SESSION['stocks'] - $prod_qty;

$update = mysqli_query($conn, "UPDATE products SET `stocks` = '$newstocks' WHERE productname = '$product'");


$sql = ("INSERT INTO `transactions`(`username`, `user_id`, `customer_address`, `customer_contact`,`customer_email`, `prod_name`, `prod_qty`) VALUES ('$username','$name','$address','$contact', '$email','$product', '$prod_qty')");
$result = $conn->query($sql);
    
if($result === TRUE){
      echo $message;
  }

}
?>


<meta http-equiv="refresh" content="3;URL=../index.php"/>
Redirecting to home page in 3 seconds. Or redirect <a href="../index.php">now.</a>

＆＃13;

当我在name = $ _ SESSION [＆＃39; userid＆＃39;]中使用userid时，它不会放置值，但是当我使用用户名时，它会显示用户名。

Answer 1

首先使用

开始您的会话

在session_start（）;

存储会话变量

$名称= $ _ SESSION [ '用户ID'];

$ _ SESSION [ '用户ID'] = $名称;

现在执行您的查询

Answer 2

在<?php ...

<?php
    session_start();
    $_SESSION['my_variable'] = $myvariable;
?>

我将提供一个示例：

<?php session_start(); $myvariable = $_SESSION['my_variable']; echo "<table><tr><td>$myvariable</td></tr><table>"; ?>

将此文件命名为'index.php'。

现在在另一个档案中：

{{1}}

Answer 3

我认为你正在寻找这样的东西：

<?php
session_start();
if (isset($_SESSION['userid'])) {
    $userid = $_SESSION['userid'];
    $db_host = "localhost";
    $db_name = "test";
    $db_user = "root";
    $db_pass = "toor";
    $db = new PDO("mysql:host=$db_host;dbname=$db_name;charset=utf8","$db_user","$db_pass");
    $stmt = $db->prepare(
        "INSERT INTO `tblusers`(`id`, `userid`) VALUES (:id, :userid)"
    );
    $stmt->execute(
        array(
            'id' => NULL,
            'userid' => $userid
        )
    );
}

如何将用户ID会话变量插入表

3 个答案: